INCOME TAXES - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Developer deposits for contributions in aid of construction	$ 31,589	$ 31,777
Net operating loss carry-forward and tax credits	18,329	29,206
Pension liability	13,860	13,570
Income tax regulatory liability	22,838	26,565
Operating leases liabilities	4,170	4,310
Other	4,264	2,439
Total deferred tax assets	95,050	107,867
Deferred tax liabilities:
Property related basis and depreciation differences	393,007	362,139
WRAM/MCBA and interim rates balancing accounts	14,192	22,124
Operating lease-right to use asset	4,130	4,286
Other	13,972	13,965
Total deferred tax liabilities	425,301	402,514
Net deferred tax liabilities	$ 330,251	$ 294,647